MPL 20x3x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020130
GTIN/EAN: 5906301811367
length
20 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.9 g
Magnetization Direction
↑ axial
Load capacity
2.33 kg / 22.90 N
Magnetic Induction
370.68 mT / 3707 Gs
Coating
[NiCuNi] Nickel
0.394 ZŁ with VAT / pcs + price for transport
0.320 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical data of the product - MPL 20x3x2 / N38 - lamellar magnet
Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020130 |
| GTIN/EAN | 5906301811367 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 3 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.9 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.33 kg / 22.90 N |
| Magnetic Induction ~ ? | 370.68 mT / 3707 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| remenance Br [min. - max.] ? | 12.2-12.6 | kGs |
| remenance Br [min. - max.] ? | 1220-1260 | mT |
| coercivity bHc ? | 10.8-11.5 | kOe |
| coercivity bHc ? | 860-915 | kA/m |
| actual internal force iHc | ≥ 12 | kOe |
| actual internal force iHc | ≥ 955 | kA/m |
| energy density [min. - max.] ? | 36-38 | BH max MGOe |
| energy density [min. - max.] ? | 287-303 | BH max KJ/m |
| max. temperature ? | ≤ 80 | °C |
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
| properties | values | units |
|---|---|---|
| Vickers hardness | ≥550 | Hv |
| Density | ≥7.4 | g/cm3 |
| Curie Temperature TC | 312 - 380 | °C |
| Curie Temperature TF | 593 - 716 | °F |
| Specific resistance | 150 | μΩ⋅cm |
| Bending strength | 250 | MPa |
| Compressive strength | 1000~1100 | MPa |
| Thermal expansion parallel (∥) to orientation (M) | (3-4) x 10-6 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Technical analysis of the magnet - data
The following information represent the direct effect of a mathematical analysis. Results are based on algorithms for the material Nd2Fe14B. Operational performance may deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
MPL 20x3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3700 Gs
370.0 mT
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
medium risk |
| 1 mm |
2103 Gs
210.3 mT
|
0.75 kg / 1.66 pounds
752.3 g / 7.4 N
|
weak grip |
| 2 mm |
1172 Gs
117.2 mT
|
0.23 kg / 0.52 pounds
233.7 g / 2.3 N
|
weak grip |
| 3 mm |
721 Gs
72.1 mT
|
0.09 kg / 0.20 pounds
88.5 g / 0.9 N
|
weak grip |
| 5 mm |
345 Gs
34.5 mT
|
0.02 kg / 0.04 pounds
20.3 g / 0.2 N
|
weak grip |
| 10 mm |
101 Gs
10.1 mT
|
0.00 kg / 0.00 pounds
1.7 g / 0.0 N
|
weak grip |
| 15 mm |
42 Gs
4.2 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
weak grip |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
weak grip |
| 30 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage force (wall)
MPL 20x3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
|
| 1 mm | Stal (~0.2) |
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MPL 20x3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.70 kg / 1.54 pounds
699.0 g / 6.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MPL 20x3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
|
| 1 mm |
|
0.58 kg / 1.28 pounds
582.5 g / 5.7 N
|
| 2 mm |
|
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
|
| 3 mm |
|
1.75 kg / 3.85 pounds
1747.5 g / 17.1 N
|
| 5 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 10 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 11 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 12 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MPL 20x3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
OK |
| 40 °C | -2.2% |
2.28 kg / 5.02 pounds
2278.7 g / 22.4 N
|
OK |
| 60 °C | -4.4% |
2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
|
|
| 80 °C | -6.6% |
2.18 kg / 4.80 pounds
2176.2 g / 21.3 N
|
|
| 100 °C | -28.8% |
1.66 kg / 3.66 pounds
1659.0 g / 16.3 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 20x3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
5.06 kg / 11.17 pounds
4 866 Gs
|
0.76 kg / 1.67 pounds
760 g / 7.5 N
|
N/A |
| 1 mm |
3.01 kg / 6.64 pounds
5 705 Gs
|
0.45 kg / 1.00 pounds
452 g / 4.4 N
|
2.71 kg / 5.97 pounds
~0 Gs
|
| 2 mm |
1.64 kg / 3.61 pounds
4 205 Gs
|
0.25 kg / 0.54 pounds
245 g / 2.4 N
|
1.47 kg / 3.24 pounds
~0 Gs
|
| 3 mm |
0.89 kg / 1.97 pounds
3 106 Gs
|
0.13 kg / 0.29 pounds
134 g / 1.3 N
|
0.80 kg / 1.77 pounds
~0 Gs
|
| 5 mm |
0.31 kg / 0.67 pounds
1 816 Gs
|
0.05 kg / 0.10 pounds
46 g / 0.4 N
|
0.27 kg / 0.61 pounds
~0 Gs
|
| 10 mm |
0.04 kg / 0.10 pounds
690 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 pounds
202 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
24 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
14 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
9 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
6 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
5 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
3 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (kinetic energy) - warning
MPL 20x3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
51.34 km/h
(14.26 m/s)
|
0.09 J | |
| 30 mm |
88.88 km/h
(24.69 m/s)
|
0.27 J | |
| 50 mm |
114.74 km/h
(31.87 m/s)
|
0.46 J | |
| 100 mm |
162.27 km/h
(45.08 m/s)
|
0.91 J |
Table 9: Surface protection spec
MPL 20x3x2 / N38
| Technical parameter | Value / Description |
|---|---|
| Coating type | [NiCuNi] Nickel |
| Layer structure | Nickel - Copper - Nickel |
| Layer thickness | 10-20 µm |
| Salt spray test (SST) ? | 24 h |
| Recommended environment | Indoors only (dry) |
Table 10: Construction data (Flux)
MPL 20x3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 748 Mx | 17.5 µWb |
| Pc Coefficient | 0.32 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 20x3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.33 kg | Standard |
| Water (riverbed) |
2.67 kg
(+0.34 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet holds just approx. 20-30% of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Temperature resistance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.
Elemental analysis
| iron (Fe) | 64% – 68% |
| neodymium (Nd) | 29% – 32% |
| boron (B) | 1.1% – 1.2% |
| dysprosium (Dy) | 0.5% – 2.0% |
| coating (Ni-Cu-Ni) | < 0.05% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros as well as cons of rare earth magnets.
Strengths
- Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
- Magnets effectively resist against demagnetization caused by external fields,
- Thanks to the shiny finish, the plating of nickel, gold, or silver gives an aesthetic appearance,
- Magnets exhibit impressive magnetic induction on the outer layer,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- In view of the potential of free forming and adaptation to specialized solutions, NdFeB magnets can be created in a broad palette of forms and dimensions, which makes them more universal,
- Wide application in electronics industry – they find application in data components, electric drive systems, precision medical tools, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices
Weaknesses
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complicated forms in magnets, we propose using cover - magnetic mechanism.
- Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what it depends on?
- with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
- whose transverse dimension reaches at least 10 mm
- with a plane perfectly flat
- under conditions of no distance (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- in temp. approx. 20°C
What influences lifting capacity in practice
- Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
- Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
- Steel thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
- Steel type – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate decreases the load capacity.
Warnings
Impact on smartphones
GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the sensors in your phone.
Crushing force
Protect your hands. Two powerful magnets will join immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Risk of cracking
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Safe operation
Handle magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their power.
Allergic reactions
Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, cease handling magnets and use protective gear.
Demagnetization risk
Do not overheat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Safe distance
Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.
Mechanical processing
Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Implant safety
Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Danger to the youngest
NdFeB magnets are not intended for children. Swallowing a few magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires immediate surgery.
